Continuous E-Beam Lithography Pattern Writing
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Solution Overview
Problem
Conventional e-beam lithography processes experience inefficiencies due to the 'shot-and-stop' method, which increases energy consumption and time, and affects pattern fidelity, in writing designs onto semiconductor wafers or photomasks.
Innovation Solution
The method involves decomposing the IC design layout into sub-polygons and curvilinear sectors, allowing for continuous writing with optimized beam settings and minimal pause times, using a data processing unit to generate pattern writing instructions that control the exposure unit to maintain beam continuity, thereby reducing energy consumption and improving pattern fidelity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the shot-and-stop method is used in e-beam lithography, then the pattern can be written on the substrate, but energy consumption increases and writing time increases
Solution Approach 1:
The patent implements continuous writing mode where the e-beam remains active without periodic shutdowns between shots. The beam is continuously deflected to trace the pattern contours, eliminating the stop-start cycle of conventional methods. This continuous operation reduces energy consumption while maintaining high writing speed, directly resolving the contradiction between energy efficiency and productivity.
2Loss of time
If the shot-and-stop method is used in e-beam lithography, then the pattern can be written on the substrate, but writing time increases
Solution Approach 1:
By maintaining continuous e-beam operation and eliminating pause times between shots, the patent significantly reduces total writing time. The beam continuously traces pattern contours without interruption, transforming the discontinuous shot-and-stop process into a smooth continuous operation that improves writing speed and reduces time loss.
Solution Approach 2:
The patent performs preliminary decomposition of the pattern into contour lines and generates deflection signals in advance. This preparation allows the e-beam to immediately begin continuous writing without setup delays, further reducing writing time while maintaining high productivity.
3Manufacturing precision
If the shot-and-stop method is used in e-beam lithography, then the pattern can be written on the substrate, but pattern fidelity deteriorates
Solution Approach 1:
The continuous e-beam operation eliminates the start-stop cycles that cause positioning errors and pattern distortion. By maintaining constant beam flow and continuous deflection control, the patent achieves superior pattern fidelity while sustaining high writing speeds, directly resolving the contradiction between precision and productivity.
Solution Approach 2:
The patent employs dynamic deflection control where the e-beam position is continuously adjusted in real-time to trace complex pattern contours. This dynamic control mechanism maintains precise beam positioning throughout continuous writing, ensuring high pattern fidelity without sacrificing writing speed.
4Device complexity
If conventional e-beam lithography is used, then the process is simple, but manufacturing complexity increases due to inefficiencies
Solution Approach 1:
The patent segments the pattern into contour lines and processes each contour continuously. This segmentation approach, combined with continuous writing, simplifies the overall manufacturing process by eliminating complex stop-start control sequences while improving efficiency and ease of manufacture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces energy consumption and time required for pattern writing while enhancing the fidelity of the written pattern, improving the manufacturability and complexity of ICs in semiconductor manufacturing.
Implementation Method 1
an e-beam is directed at a target material (e.g., a photomask or a wafer) coated with a photosensitive material to write a desired pattern on the target material
Data Source
AI summary
The present disclosure provides one embodiment of a method that includes slicing a first sub-polygon out of the pattern layout and writing the first sub-polygon onto the substrate using a beam with a first beam setting that is associated with the first sub-polygon. The method additional includes slicing a second sub-polygon out of the remaining pattern layout that does not include the first sub-polygon. The second sub-polygon interfaces with the first sub-polygon on at least one edge. Also, the method includes, without turning off the beam after writing the first sub-polygon onto the substrate, writing the second sub-polygon onto the substrate with a second beam setting that is associated with the second sub-polygon.